The Psalmist is expressing his longing for the Lord to shepherd and lead him in the paths of righteousness. He knows that God is faithful in His truth and the enlightenment which comes from it. We see this confidence repeated in Psalm 27:1, “The Lord is my Salvation; whom shall I fear? The Lord is the stronghold of my life; of whom shall I be afraid?” So in other words, God’s light and truth brings clarity, order, and understanding into every situation we’ll ever encounter as we allow Him to guide us along life’s journey.